From 8a7ecfa3bba502421ba26adf8d8d76eb714aa821 Mon Sep 17 00:00:00 2001
From: kolaente <k@knt.li>
Date: Sun, 21 Jun 2020 13:19:54 +0200
Subject: [PATCH] Check if we have a service worker available before trying to
 communicate with it

---
 src/App.vue | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/src/App.vue b/src/App.vue
index e5f27f64c..6e83f29e1 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -329,13 +329,15 @@
 			// Service worker communication
 			document.addEventListener(swEvents.SW_UPDATED, this.showRefreshUI, {once: true})
 
-			navigator.serviceWorker.addEventListener(
-				'controllerchange', () => {
-					if (this.refreshing) return;
-					this.refreshing = true;
-					window.location.reload();
-				}
-			);
+			if (navigator && navigator.serviceWorker) {
+				navigator.serviceWorker.addEventListener(
+					'controllerchange', () => {
+						if (this.refreshing) return;
+						this.refreshing = true;
+						window.location.reload();
+					}
+				)
+			}
 
 			// Try renewing the token every time vikunja is loaded initially
 			// (When opening the browser the focus event is not fired)
@@ -344,7 +346,7 @@
 			// Check if the token is still valid if the window gets focus again to maybe renew it
 			window.addEventListener('focus', () => {
 
-				if(!this.userAuthenticated) {
+				if (!this.userAuthenticated) {
 					return
 				}